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タイトル: | Early Detection of Baby-Rain-Cell Aloft in a Severe Storm and Risk Projection for Urban Flash Flood |
著者: | Nakakita, Eiichi Sato, Hiroto Nishiwaki, Ryuta Yamabe, Hiroyuki Yamaguchi, Kosei https://orcid.org/0000-0002-0885-169X (unconfirmed) |
著者名の別形: | 中北, 英一 佐藤, 悠人 山口, 弘誠 |
発行日: | 2017 |
出版者: | Hindawi Publishing Corporation |
誌名: | Advances in Meteorology |
巻: | 2017 |
論文番号: | 5962356 |
抄録: | In July 2008, five people were killed by a tragic flash flood caused by a local torrential heavy rainfall in a short time in Toga River. From this tragic accident, we realized that a system which can detect hazardous rain-cells in the earlier stage is strongly needed and would provide an additional 5 to 10 min for evacuation. By analyzing this event, we verified that a first radar echo aloft, by volume scan observation, is a practical and important sign for early warning of flash flood, and we named a first echo as a “baby-rain-cell” of Guerrilla-heavy rainfall. Also, we found a vertical vorticity criterion for identifying hazardous rain-cells and developed a heavy rainfall prediction system that has the important feature of not missing any hazardous rain-cell. Being able to detect heavy rainfall by 23.6 min on average before it reaches the ground, this system is implemented in XRAIN in the Kinki area. Additionally, to resolve the relationship between baby-rain-cell growth and vorticity behavior, we carried out an analysis of vorticity inside baby-rain-cells and verified that a pair of positive and negative vertical vortex tubes as well as an updraft between them existed in a rain-cell in the early stage. |
著作権等: | © 2017 Eiichi Nakakita et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
URI: | http://hdl.handle.net/2433/218752 |
DOI(出版社版): | 10.1155/2017/5962356 |
出現コレクション: | 学術雑誌掲載論文等 |
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